Hi,

I'm seeing consistent behaviour when running `jq` on Cygwin, where
commands that should trigger jq to produce an error message instead
cause it to assert and die.

Simple test case: run `jq -n 'error("oh no!")'`, which should raise a jq
error with the text "oh no!".

Output on Cygwin:

    $ jq -n 'error("oh no!")'
    assertion "cb == jq_util_input_next_input_cb" failed: file "/cygdrive/d/a/scallywag/jq/jq-1.7.1-1.x86_64/src/jq-1.7.1/src/util.c", line 360, function: jq_util_input_get_position
                     Aborted

Expected output, as seen on my handy Debian box:

    $ jq -n 'error("oh no!")'
    jq: error (at <unknown>): oh no!

I've attached the cygcheck.out file from the system where I ran the
above.

Cheers,

Adam